<wicket:head>
    <style>
        table.wicket-tree-content {
            width: 100%;
        }
        td {
            font-size: 82%;
        }
    </style>
</wicket:head>
<wicket:panel>
    <table >
    	<tr>
    		<td>
        		<div wicket:id="tree" class="my-tree">  
        		</div>  
    		</td>
    	</tr>
    	<tr>
    		<td>
				<a wicket:id="newFolderLink">Nueva Subcarpeta en <div wicket:id="selectedFolder"/></a>
    		</td>
    	</tr>    	
    </table>
</wicket:panel>